Stock plugs at factory boost level are typically good for 50,000 to 60,000 miles. Higher boost levels on race plugs require more frequent replacement. Most street driven cars with Brisk plugs should expect to replace the plugs every 10,000 to 20,000 miles. You’ll know when it’s time, because you’ll start experiencing misfires under boost.
Brisk Silver Racing spark plugs have a better ignitability than conventional performance spark plugs, and offer better performance and reliability in high boost, nitrous or high compression applications. Silver is an element with the most free electrons, and is the best electrical and thermal (heat) conductor of all metals! Better than gold, copper …and many times better than Iridium. The Brisk Silver Racing plugs have a fine wire center electrode (not just the tip), which gives more room for insulator between the center electrode and spark plug shell. More insulation results in a durable spark plug with high dielectric strength, which is the most important spark plug parameter in forced induction applications.
When you replace the spark plugs, always apply anti-seize to the spark plug threads and dielectric grease on the inside of the spark plug boots. This will ensure the plugs can be easily removed in the future and displace the air inside the rubber boots, which will in turn prevent carbon tracking and misfires under boost. We include four gram packets of dielectric connector grease and anti-seize lubricant with all spark plug shipments. Recommended torque value when installing in aluminum cylinder heads is 8 to 14 foot-pounds.
Brisk Silver Racing spark plugs are a better option than Denso or NGK iridium spark plugs for those wanting a plug that’s pre-gapped and offers maximum performance. Projected tip spark plugs (i.e. OEM, RR14YS or RR12YS) will tend to burn a little hotter. This will make them idle better, get better fuel economy and last longer. Non-projected tip plugs (i.e. RR12S) run colder and perform better at high boost levels. Just like most things in life, it’s a tradeoff.
• OEM LT4 spark plugs are AC Delco 41-128, part number 12642722, iridium, gapped between .028 and .034″.
• RR14YS are approximately one heat range colder than stock, have projected tips just like OEM and come pre-gapped in the sweet spot of .026 to .028”. We recommend these for 10 to 12 psi of boost.
• RR12YS are approximately two heat ranges colder than stock, have projected tips just like OEM and come pre-gapped in the sweet spot of .026 to .028”. We recommend these for 12 to 14 psi of boost. These will last a little longer than the RR12S plugs.
• RR12S have non-projected tips, and are approximately two heat ranges colder than stock. This plug style is better for reducing unwanted detonation in higher boost applications. However, these will foul easier than projected tip spark plugs. We recommend RR12S for 14 to 16 psi of boost. These should be gapped down to .024″. And they will provide better performance than the RR12YS plugs.
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